Adjustable wrench.



M. R. HALD. ADJUSTABLE WRENCH. APPLIGATION FILED PB ls, 1914.

Patented Aug. 11, 1914.

WTNESSES: INVENTOR.

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MARTIN R. Heim, or FRESNO, cALlroRNIA.

ADJUSTABLE WRENCH.

Specification of Letters Patent.

Patented Aug. 11, 1914.

Application led April 13, 1914. Serial No. 831,639.

To all whom t may concern Be it known that I, MARTIN R. I-IALD, a citizen of the Kingdom of Denmark, and a resident of the city of Fresno, county of Fresno, and State of California, have invented a new and useful Improvement in Adjustable l/Vrenches, of which the following is a specification.

y invention relates to adjustable wrenches of that kind in which there is a jaw fixed on a rack, and a loose jaw slidably mounted on such rack and adjustable thereon by double means, to-wit, by a Worm pivoted to the slidable jaw and adapted to engage such rack, and by means for disengaging such worm and sliding the j aw on the rack, the object of my invention being simplicity of construction, ease with which the worm will mesh with the teeth, and other objects which will hereinafter appear.

In the drawings accompanying this specication Figure l is a side elevation of my wrench with the worm engaged with the rack. Fig. 2 with the rack. Fig. 3 shows the pivot bcfore assembling the Wrench. Fig. 4 shows the eccentric pivot after the wrench is assembled. Fig. 5 shows the handle for turning eccentric pivot. Fig. 6 is an end view of the movable jaw.

In my construction I use an ordinary rigid jaw A which is attached to one end of a rack B. Each tooth, r, on rack B is constructed preferably in the form of a right angle triangle, with the side of the tooth nearest the fixed jaw perpendicular. The points of such teeth are slightly rounded so an operator can handle the wrench without cutting or scratching himself.

C is a movable jaw adapted to slide freely on rack B, and has'an opening thereon cut deep enough so the teeth 7 on rack B will extend above the bottom of such opening.

D is a worm pivoted as hereinafter set forth in opening m, with an eccentric pivot, in such relation to the teeth r that by turning the eccentric toward teeth r worm D Will engage such teeth, and by turning the eccentric from teeth a", Worm D will be disengaged therefrom.

shows the Worm disengg,a,:0,'ed

pressure is then applied to Worm D The object in having teeth 1 on rack B approximatelypointed is to permit the Worm slide more readily into mesh as the eccentric is moved toward such teeth. The object of having the side of the teeth nearest the fixed jaw perpendicular to the base is to more readily withstand the pressure when the wrench is in use, and the object of pivoting the worm on an eccentric pivot is to more readily slide the movable jaw to the position desired by releasing worm D from rack B, than is possible in Wrenches in which the worm has a fixed relation to the rack.

1/ and y are small recesses in the Walls of the openingw, the purpose being to permit the eccentric pivot to turn freely.

.2 is a hole of uniform diameter extending laterally into the movable jaw from the end opposite the fixed jaw, to a point beyond the opening e is a hole of the same diameter as hole e through the center of worm D.

M is an eccentric pivot which rotatingly lits into holes .e and e. Pivot M extends slightly beyond the outside wall of movable jaw and carries a handle H, which is adapted to hold pivot M firmly when the worm D is either engaged with the rack, or wholly disengaged therefrom.

In assembling the Wrench I use a straight pivot IVI (shown in Fig. 3) which is inserted through holes e and e. Sufficient to engage such worm with the teeth of the rack, thus forming straight pivot M into eccentric pivot i `What I claim as my invention and what I desire Letters Patent is:

In a wrench the combination of a jaw iixed on one end of a rack, a movable jaw slidably mounted on such rack, a worm adapted to mesh With the teeth of such rack, a pivot of approximately uniform diameter having an eccentric portion, an opening in such movable jaw adapted to contain such worm and to permit operative relation between such worm and such rack, such opening having walls on two sides thereof adapted to support bearings for carrying such pivot, a hole of uniform diameter in such upon Walls and through the lateral center of such such rack, the Worm Will be disengaged Worm adapting the Worm to be rotatngly therefrom, all substantially as described.

carried by such pivot in such relation With such rack that When the Wrench is assembled and such eccentric is turned toward such rack the Worm Will mesh therewith' and When such eccentric is turned away from MARTIN R. HALD.

Witnesses:

' ANITA' GIL,` H. A. HUEBNER.

Copies of this patent may be obtained forA lfive` centseaoh, addressing the Commissioner of IPatents,

. v Washington, D. G. 

